Tooth profile measuring method

The invention relates a tooth profile measuring method. The tooth profile measuring method includes the following steps that (1) AutoCAD and Microsoft Excel library function parameters are loaded through Visual Basic 6.0, and a theoretical tooth profile data base is built; (2) tooth profile data of a gear to be measured are obtained; (3) tooth profile alignment is conducted through data comparison; (4) the step (3) is repeated many times, and a plurality of alignment points are found out; (5) multiple groups of actual tooth profile points to be detected are obtained through theoretical tooth profile points built in the step (1); (6) an arbitrary point A is set on the involute of the gear to be detected, and a tooth profile error is worked out through a Cartesian coordinate origin and a D point coordinate. The tooth profile measuring method is high in accuracy, low in hardware equipment requirement, wide in application range and high in efficiency.